science f.1 unit 7

A Multiple-choice questions 1 Some gas is bubbled into hydrogencarbonate indicator and the indicator

turns from red to yellow. The gas can be A oxygen. B nitrogen. C hydrogen. D carbon dioxide.

2 Some gas is bubbled into lime water and the lime water remains clear. What

is the conclusion? A The gas is oxygen. B The gas must not be carbon dioxide. C The gas must not be nitrogen. D The gas is hydrogen.

3 In the test for water, we use

A cobalt chloride paper. B lime water. C hydrogencarbonate indicator. D iodine solution.

4 If some oil in a cooking pan catches fire when cooking, we should

(1) pour water to it to put out the fire. (2) cover the flames with a lid. (3) take the pan with the burning oil away from the stove. A (1) only B (2) only

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UNIT 7 LIVING THINGS AND AIR

C (3) only D (1), (2) and (3) 5 The energy we need for all body activities comes from

A the sun. B air. C food. D water.

E6 With reference to the following food labels, which food contains the greatest

amount of energy per serving? A B

C D

7 In the test for starch, what is the reason of putting the leaf in hot

alcohol? A To kill the germs on the leaf. B To remove water from the leaf. C To detect the presence of starch in the leaf. D To dissolve chlorophyll from the leaf.

E8 What are structure X and Y in the following X-‐ray film?

X Y

A rib lung B diaphragm intercostal muscle C lung diaphragm D lung rib

E9 What is the action of ribs when we breathe out?

A They move upwards and outwards. B They move inwards and downwards. C They contract. D They relax.

10 Some plant cells are shown in the following diagram. What is the main

function of structure X?

X

A Photosynthesis B Storage of food

Y

X

C Gaseous exchange D Water evaporation 11 What are the major sources of air pollutants in Hong Kong?

(1) Vehicles (2) Cigarette smoke (3) Construction sites (4) Factories in Pearl River Delta A (1) and (2) only B (2) and (4) only C (1), (3) and (4) only D (2), (3) and (4) only

12 The following setup can collect substances from cigarette smoke. After a

short period of time, the cotton wool in the U-‐shaped tube is stained brown. What substance causes the colour change?

A Carbon monoxide B Tar C Nicotine D Smoke particles

*E13 The following diagram shows a destarched plant. The plant is put under light for several hours. Which leaf of the plant will turn blue black in an iodine test?

to air pump

cigarette

cotton wool

U-shaped tube

A Leaf P B Leaf Q C Leaf R D Leaf S 14 Plants are important to all living things on Earth because

(1) they balance the amount of carbon dioxide and oxygen in nature. (2) they convert light energy from the sun to chemical energy stored as food. (3) they provide camouflage (掩飾) for animals. A (1) and (2) only B (1) and (3) only C (2) and (3) only D (1), (2) and (3)

E15 Which part of the human breathing system does the diffusion of oxygen into

blood take place? A Trachea B Bronchi C Diaphragm

S

cobalt chloride

Q

sodium hydroxide

R

water P

soda lime black plastic bag

D Air sacs 16 Which air pollutants can cause respiratory illnesses?

(1) Carbon dioxide (2) Carbon monoxide (3) Nitrogen oxide (4) Sulphur dioxide A (1) and (2) only B (3) and (4) only C (1), (2) and (3) only D (1), (3) and (4) only

*E17 If all green plants on Earth died, what would be the consequences?

(1) All animals would die because there is no food for them. (2) All animals would die because there is not enough oxygen for respiration. (3) All animals could survive because some animals can feed on the others. A (1) and (2) only B (1) and (3) only C (2) and (3) only D (1), (2) and (3)

**18 The following graph shows the gas exchange of a leaf throughout a day.

When does the plant undergo photosynthesis?

A 0 – 24 hour B 0 – 12 hour C 6 – 18 hour D 12 − 24 hour

*19 The following experiment is aimed to find out when plants take in or give

out carbon dioxide.

0 6 12 18 24

Time of the day (hour)

net r

elea

se

of c

arbo

n

diox

ide

net u

ptak

e of

carb

on d

ioxi

de

The setup is put under bright light for 30 minutes. What is the colour change of the hydrogencarbonate indicator in test-‐tube 3? What is the explanation?

Colour Explanation A Red The leaf absorbs carbon dioxide and gives out oxygen. B Red The rate of photosynthesis is the same as the rate of

respiration. C Yellow There is no photosynthesis but only respiration. D Yellow There is not enough oxygen for the leaf to breathe.

*20 All test-‐tubes are put under bright light for 30 minutes. Which test-‐tube

(among 1 to 4) gives the same result as that of X?

aluminium foil

soda lime

hydrogencarbonate

indicator 1 2 3 4

A 1 B 2 C 3 D 4

B True or false questions E1 The volume of the space inside the chest increases when the

diaphragm moves up.

grasshopper

X 1 2 3 4

aluminium foil soda lime

hydrogencarbonate

indicator

E2 The pressure inside the chest increases when the diaphragm moves up. E3 The first living thing of a food chain is a primary producer. E4 Energy is passed from one organism to another along a food chain. 5 Carbon dioxide can turn both lime water and hydrogencarbonate

indicator milky. 6 Photosynthesis is the reverse of respiration because it changes

carbon dioxide and water into food and oxygen. E7 Air sacs in lungs are covered with many capillaries for oxygen

diffusion. 8 Plants do not need gaseous exchange because they do not have

breathing system. E9 The Air Pollution Index is determined by the Health Department. If

the index is very high, people are advised not to take vigorous outdoor exercises.

10 Lime water can be used to test for oxygen.

C Fill-in-the-blanks 1 Burning of food and respiration are similar since both of them give out

___________________________and_______________. 2 The fire triangle shows the three things needed for a fire to occur, they are

_______________, _______________ and _________________. 3 Food can provide us with _______________ for all body activities which can be

measured by a __________________.

4 Starch can turn iodine solution _________________while carbon dioxide can turn hydrogencarbonate indicator _______________.

E5 The volume of the space inside the chest increases when the

_______________moves down. E6 The pressure inside the chest increases when the _____________move

downwards and inwards. E7 When the amount of carbon dioxide in the blood increases, the

__________________________in our brain sends out signals to make us breathe faster.

E8 When the ___________________ contract, the ribs move upwards and outwards. E9 In the balloon-‐bell jar model which shows the action of the diaphragm, the

Y-‐piece represents the _______________. E10 _____________________ refer to the gases which can trap heat and prevent it from

leaving the Earth’s atmosphere.

D Short questions 1 How do leaves of terrestrial green plants obtain carbon dioxide for

photosynthesis? __________________________________________________________________________________________________________________________________________________________________________________

*2 The following is a destarched plant. Leaf A is covered by a black bag. The

plant is then put under sunlight for several hours. Predict and explain the results if leaf A and leaf B are tested for starch.

___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

3 The following word equation shows the relationship between respiration

and photosynthesis. Name processes A and B, and substances X and Y?

__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ *E4 A food web is shown in the following diagram.

A

B

X + water + food Y

A

B

Find out all the food chains in this food web. __________________________________________________________________________________________________________________________________________________________________________________

E5 List the producers, primary consumers and secondary consumers in the

killer whale

seal penguin

fish

blue whale

krill microscopic algae

following food web.

__________________________________________________________________________________________________________________________________________________________________________________

killer whale

seal penguin

fish

blue whale

krill microscopic algae

6 What are the reasons of using the following to put out fire: a carbon dioxide fire extinguisher; b water

___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

E7 Use the following organisms to construct a food chain: Bird, grass, spider, snake, grasshopper

___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

*E8 The following diagram shows the steps of the test for starch in a leaf. What

is/are the mistake(s) in the steps? Give reasons.

___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

step 1 step 2

step 4 step 3

boiling water alcohol

hot water hydrogencarbonate indicator

white tile

**E9 The following diagram shows the bell-‐jar model. If the rubber sheet is punctured (刺穿), what would happen to the balloons when the rubber sheet is pulled down? Explain briefly.

___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

10 Do you agree that people should be allowed to smoke cigarettes in

restaurants? Give one reason for your answer. ___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

rubber sheet

Y-piece glass tube

balloons

E Long questions E1 The following graph shows the change in carbon dioxide concentration in the

atmosphere and the change in average temperature of the world from 1970 to 2000.

a State the relationship between the carbon dioxide concentration and the average temperature of the world. __________________________________________________________________________________________________________________________

b Calculate the percentage increase of carbon dioxide concentration from 1970 to 2000.

__________________________________________________________________________________________________________________________

c Calculate the percentage increase of the average temperature of the world from 1970 to 2000. __________________________________________________________________________________________________________________________

320

325

330

335

340

345

350

355

360

365

370

1970 1975 1980 1985 1990 1995 2000 2005

Car

bon

diox

ide

conc

entr

atio

n (p

pm)

Year

-‐ 14.50

-‐ 14.45

-‐ 14.40

-‐ 14.35

-‐ 14.30

-‐ 14.25

-‐ 14.20

-‐ 14.15

-‐ 14.10

-‐ 14.05

Temperature (°C)

CO2 concentration Temperature

d What phenomenon is being shown by the above graph?

_____________________________________________________________ e Suggest one method to decrease carbon dioxide concentration in the

atmosphere. ______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

E2 The following diagram shows the human breathing system.

a Label structures B, C, D, E and F.

_______________________________________________________________________________________________________________________________________________________________________________________

b Which structure(s) in the diagram move(s) upwards when a person breathes in?

_____________________________________________________________ c Which structure(s) in the diagram move(s) upwards when a person

breathes out? _____________________________________________________________

d Describe briefly how air is filtered when it passes through structure A. _______________________________________________________________________________________________________________________________________________________________________________________

e There are millions of structure D in the lungs. Explain why the number of structure D is so large?

______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

A

B C

D

E

F

Science Edited By Able Exercise @ 2015

*3 The following diagram shows an experiment to study the effect of carbon

dioxide concentration on the rate of photosynthesis in plants. The change of

carbon dioxide concentration is done by changing the concentration of

sodium hydrogencarbonate (NaHCO3) solution. The rate of photosynthesis

is measured by the number of gas bubbles given out from the plant per

minute.

The result of the experiment is listed in the following table.

Concentration

of NaHCO3

solution (%)

0 1 2 3

Number of

gas bubbles

given out per

minute

6 13 28 52

a List two factors that may affect the rate of photosynthesis and should

be kept constant during the experiment.

_____________________________________________________________

b Suggest what gas is given out from the plant during the experiment.

_____________________________________________________________

c How to identify the gas given out?

__________________________________________________________________________________

d Why the rate of photosynthesis can be measured in terms of the

sodium

hydrogencarbonate

solution

a plant


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number of gas bubbles given out per minute?

__________________________________________________________________________________

__________________________________________________________________________________

e Use the data in the table to plot a graph showing the relationship

between carbon dioxide concentration and the rate of photosynthesis.

f What conclusion can you draw from this experiment?

_____________________________________________________________

_____________________________________________________________


**E4 The following is a food web.

a What is a food chain?

__________________________________________________________________________________

__________________________________________________________________________________

b List one of the longest food chain in the above food web.

__________________________________________________________________________________

c List the producers, primary consumers and secondary consumers in

the above food web.

__________________________________________________________________________________

__________________________________________________________________________________

__________________________________________________________________________________

__________________________________________________________________________________

d What will happen to the number of snake and grasshopper if all the

rodents suddenly died from a certain disease?

__________________________________________________________________________________

__________________________________________________________________________________

eagle

grasshopper

lizard

snake

bushes

grasses

rodent


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__________________________________________________________________________________

__________________________________________________________________________________

*E5 The following diagram shows an experiment to study the different

conditions for photosynthesis. All leaves are collected from a destarched

plant.

a The colour of the hydrogencarbonate indicator was red at the

beginning of the experiment. What would be the colour change of the

hydrogencarbonate indicator in test-‐tubes A, B and D at the end of the

experiment?

__________________________________________________________________________________

__________________________________________________________________________________

b Explain why the colour of the hydrogencarbonate indicator in test-‐tube

C remained red at the end of the experiment.

__________________________________________________________________________________

__________________________________________________________________________________

soda lime water

hydrogencarbonate

indicator

A D C B

muslin

cloth

black box


_____________________________________________________________

c After the experiment, the leaves were tested for the presence of starch.

Which leaf / leaves would have a positive result?

__________________________________________________________________________________

d Referring to test-‐tube A, explain

i the colour change of the hydrogencarbonate indicator, and

ii the result of the test for starch.

__________________________________________________________________________________

__________________________________________________________________________________

__________________________________________________________________________________

__________________________________________________________________________________

science f.1 unit 7

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